Wax stencil.



H. E. KRUEGER.

WAX STENCIL.

APPLICATION FILED HR. 11, 1913.

Patented Aug. 5, 1913.

Fig.2.

KMzw M M HERMANN EDWIN xnoncnn, or nnnLm-wrrmnasnonr, GERMANY.

WAX STENCIL.

Specification of Letters Patent.

Patented Aug. 5,1913.

Application filed April 11, 1913, Serial No. 760,341.

T 0 a?! whom 2' t ma y concern:

lie it known that I, HERMAXN Eowns Km'nuun, a citizen of the Empire of Germany, residing at Berlin-Vilmersdorf, in the Empire of Germany, have invented new and useful Improvements in ax Stencils, of which the following is a specification.

Hitherto, when utilizing typewriting machines for the preparation of stencils for ('OPYIXIQ' or duplicating work, 1t has been customary to usein combination a sheet of wax paper, a sheet of thin silk paper to protect the type and a sheetof oiled or other stout paper as an underlay or foundation. These sheets, when used in rotary stencilint, machines, have generally been fastened together at-the top of the writing surface by ,runnnin; or pressing them together and it has been necessary to attach, at the top of the side adapted to receive the impression, some contrivance for fastening the wax paper to the drum or cylinder of the stencil duplicating machine. For this purpose clips, notches and tongues in the paper, or similar :fastening contrivances'have been used. \Vith such a method the choice of fastening contrivances is extremely limited, because the fastening attached to the top of the sideada-pted to receive the impression must always run over the roller of the t-ypewriting machine. Serious disadvantages present themselves with such fastening, as, for example, in the case of notches and tongues, the fastening is apt to be torn in .the typewriter, especially when the wax paper is turned back. The disadvantages are obviously even greater when clips are used. Moreover, such fastenings are easily damaged when fitting the same to the metal tongue of the duplicating drum,

and further, in most cases, such methods of attaching the wax paper to the drum allow the paper to be brought into only one definite position, so that it is impossible to shift the stencil to right or to left when the letters at the outer edge of the stencil are not printed completely during the operation of copying, or duplicating.

The object of the present invention is to overcome these defects and to achieve this the wax paper, with the sheet covering the type, and the underlay, are used in the typewriter in conjunction with an inlay sheet, which latter gives a copy in the known manner, in addition to the imprint made on the stencil. For example, the wax: paper may be used in conjunction with a sheet of thin silk paper as a type protector, a sheet of carbon paper, and a sheet of stout paper as an underlay or back.

To permit of corrections of the text being readily made on the wax paper, the four sheets above mentioned are fastened together both at top and: at bottom, being provided with detachable or removable edges. At the topall the layers or sheets are perforated so. that the top.- strips can simply be torn oii' after the sheets are put into the typewriter. The sheets will then be fastened together only at the bottom, and as thebottom edge neverreqpires to run through the typewriter, the danger of damaging the fastening is obviated. Perforations are also made at the bottom of the sheets but in this instance no perforations are made through the wax stencil paper. The fastening contrivances are in the form of metal hooks, clips or other like appliances, such as will permit of easy and efficient fastening to the duplicator drum.

Stencils of this nature possess obvious adduced into the typewriting machine. Fur-' ther, owingto the sheets beingattached at their ends, and owing to the existence of the detachable strips, the fastenin attached to the strip atthe bottom 0 not require to run through the typewriting machine or over its roller. Obviously, therefore, anykind of fastening may be used, such as books, clips or the like and theymay be of such a form that it will be possible to shift the joined sheets either to the right or to the left in order that letters may appear .on the extreme edge during the production of copies on the copying or dupli-' eating machine and the stifi strip made by pressing or 'gumming the sheets together can be used to the fullest advantage for the fastening purposes. The system of fastening, according to the present invention, is adaptable to any copying or duplicating machine of the rotary type.

\ I will now proceed to describe my invenpressing the separate sheets together.

dotted line X. X, Fig. 1. e

I Similar letters of reference refer to similar parts in both views.

As will be seen from the drawings, the

w device. comprises four sheets q, I), 0, d. or

represents the thin silk paper used to protect the type; bthe wax or stencil paper; the carbon paper, preferably of any color desired; and d; a firm backing or underlay, preferably of paper. All these sheets are joined together both. at the top edge and at the narrow bottom edge of the side adapted to receive the impression. This is done in the usual way by gumming Zr t the top edge all the sheets, including the wax paper are perforated, but at the bottom edge the wax paper itself is not. perforated. The sheet a to 'p'rqtect the type is generally so thin that it can be removed without any perforating being required.

From the foregoing it will be understood that a narrow strip which may be completely detached, is obtained at the top edge while, at the bottom edge, the strip may remain firmly attached to the wax paper, Which is not perforated, when the other sheets have been detached where perforated. On the bottom strip are the fastening hooks or clips 7, 'which embrace not only the Wax paper but the whole attachment strip which holds the auxiliary sheets and the wax paper. The clips or fastenings can be of any form desired, provided they give a satisfactory ii attachment of the stencil to the drum of the copying or duplicating machine. They i may be made of metal or any other suitable material.

The sheets, united as described, are used as follows The top edge of the combined sheets, i. 6., the edge on which there are no fastening hooks or clips-contrary to the system of fastening together hitherto in useis put into the typewriting machine and the sheets are made to pass over the roller of the typewriter until the top strips of the sheets can be detached at the upper line of perforations. The operator then performs the usual typewriting operation with the machine and may correct the text on the stencil at any moment. This finished, the stencil is turned backward out of the typewriter and the silk paper torn off, then the carbon paper, and lastly, the stout paper serving as an underlay or backing is detached at the line of perforation near the bottom edge. By aid of the fastening hooks or clips 1 on the bottom edge of the sheets, the stencil can be put on to the drum of the copying or duplicating machine in such a way that the end of the stencil by which it is attached will coincide with the corresponding end of the sheet of paper adapted to receive the impression as, for example. letter sheets with printed headings must be put into the machine in such a waythat said heads will pass last through the machine.

Iclaim: 1

A wax stencil for copying or duplicating machines, having in combination therewith a type protecting paper, a carbon paper and an underlay or backing sheet, all the sheets at one end being'perforated and det-achably secured together, while at the other end,

only the type protecting paper, the carbon paper, and the underlay or backing sheet are perforated for detachment or removal, fastenings being provided at this end for securing the. stencil to the copying or duplicating machine, substantially as hereinbefore described.

HERMANN EDWIN KR-UEGER. Witnesses:

HENRY HASPER, WOLDEMAR HAUPT. 

